Vector of an old transformer
Vector of an old transformer
(OP)
Dear Collegues,
I'm dealing with an old transformer, dated 1970, whose ratio is 10 / 0.4 kV.
The vector group is indicated as ynD11.
This is new for me. Is it equal to Dyn11?
What is the connection of the primary winding: yn or D?
Thank you for you help.
Cheers
Alex
I'm dealing with an old transformer, dated 1970, whose ratio is 10 / 0.4 kV.
The vector group is indicated as ynD11.
This is new for me. Is it equal to Dyn11?
What is the connection of the primary winding: yn or D?
Thank you for you help.
Cheers
Alex






RE: Vector of an old transformer
Regards
Marmite
RE: Vector of an old transformer
Was it meant to be Step-up transformer originally, with some generator connected at 400V bus!
If I remember right, the old standard was to represent the primary winding connection in the first letter.
Neverthless, presuming 400V is Star connected with neutral, then ynD11 shall correspond to Dyn1.
RE: Vector of an old transformer
You confirmed my suspects.
I asked for the photo of the faceplate.
Thank you again.